Each weight in this package is 4.48g heavier than those in our regular Polaris RZR XP Turbo clutch kit. These heavier weights paired with our ideal spring rates keep the RPM in check while providing optimal primary clamping force against the belt on high horsepower applications. This is essential for drivers using E85 fuel or cranking out massive amounts of horsepower who need more adjustment. Those who have a high performance 2016-2020 Polaris RZR XP Turbo will need this heavy kit!